I am using the official stock ROM (Froyo) rooted.
I realized that the android emulator which SDK brings has a lighter 2D version of the gallery, so I extracted Gallery.apk from /system/app through ADB.
I put it into my Blade /system/app, I changed permissions, restarted the phone and nothing. There is no new gallery inside the app drawer.

What am I doing wrong? The emulator is running Froyo.

I've tried different galleries from Google play but none suits me, specially due to Picasa integration.

I've tried different Gallery.apk from other forums with the same luck. I even tried to install them but it end with an "App is not installed" message.